Item Response Theory takes the hypothesis that every test item has its own features such as difficulty, discrimination and others, which are not related to the sample and neither to other items.

条目反应理论认为，每个测验条目有其自身固有的特征，比如难度、区分度等，这些特征与样本无关，也与其它条目无关。

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Item Response Theory takes the hypothesis that every test item has its own features such as difficulty, discrimination and others, which are not related to the sample and neither to other items.

条目反应理论认为，每个测验条目有其自身固有的特征，比如难度、区分度等，这些特征与样本无关，也与其它条目无关。

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